thermoplastic elastomers | Innovations
Key properties of some Desmopan 600 Series polyether TPUs Test
Hardness (Shore A)
Tensile stress at 100% strain (MPa) Tensile stress at break (MPa) Elongation at break (%) Tear strength (kN/m) Rebound resilience (%) Abrasion loss (mm³)
Compression set (72h/23°C), % Density (kg/m³)
Source: Bayer MaterialScience
are all very similar, while tensile strength and abrasion behaviour are said to be superior. Desmopan 600 TPUs also offer high dimensional
stability, which BMS says is “remarkable insofar as their hardness is comparatively low and they contain no plasticisers.” As a result, they display little tendency to creep, which is particularly useful for parts such as automotive seals. They also have good low-temperature flexibility, with glass transition temperatures in the region of -40°C. Flow lengths in spiral flow tests are up to twice as
long as equivalent polyester types, making 600 types highly suitable for thin-walled and intricate component geometries. As a consequence, moulders can reduce processing temperatures to achieve energy savings and shorter cycle times. Alternatively, they can reduce the injection pressure and use injection moulding machines with lower clamping forces. BMS claims the new TPUs harden more quickly than polyester types, so parts can be removed from the mould sooner. BMS sees considerable potential for the 600 types as
Below: OMFI of Italy is using API’s part renewable Mego Bio TPE to injection mould bed slat supports
elastic components in two-component injection molding of hard/soft composites where they can provide anti-slip, warm-feeling, soft touch surfaces for grips and knobs on tools and household appliances, for example. It also sees potential for the materials in single- component mouldings, such as mats and cable bushings, as well as for athletic and children’s footwear and components
for shoes and uppers such as toe
caps and logos. The latest addition to the Desmopan 600 series product line – DP6088A – is said to offer optimised mechanical properties and processing
behaviour. 48 INJECTION WORLD | April 2015 The latest TPU introductions from Lubrizol Engineered
Polymers include a high-heat TPU grade - Estane TS92AP7 – formulated for superior abrasion and chemical resistance. The new product is also said to feature good high temperature resistance and low temperature flexibility. “With its 125°C rating and UL yellow card certification, Estane TS92AP7 is the next generation of high-heat-resistant TPUs for cable jacketing and injection moulded components,” Lubrizol says.
Renewable options Lubrizol also offers its Bio TPU products, which are made using renewable-sourced material and are claimed to provide the same performance as traditional petroleum-based TPUs. Bio TPU hardnesses range from 82 Shore A to 55 Shore D. Italian compounder API also has a new bio-TPE, Megol Bio, which is an SEBS type containing up to 25% renewa- ble-sourced content. One of the company’s customers in Italy, furniture maker OMFI, is using Megol Bio for an innovative “green” alternative in bed slat suspensions. “Not only is this innovative suspension 100% recyclable, but it also maintains a series of technical and functional advantages such as resistance to ageing and good and constant elastic qualities,” API claims.
Click on the links for more information: ❙
www.robertellerassoc.com ❙
www.hexpoltpe.com ❙
www.polymaxtpe.com ❙
www.albis.com ❙
www.kraiburg-tpe.com ❙
www.teknorapex.com ❙
www.elastron.com ❙
www.dynasolelastomers.com ❙
www.glstpes.com ❙
www.materialscience.bayer.com ❙
www.lubrizol.com ❙
www.apiplastic.com
www.injectionworld.com
DP.6064A 65
2,8
18,3 1084 28,9 45 12 20
1091
DP.6072A 71
3,5
18,8 759 32,1 46 11 18
1097
DP.6080A 81
5,4 20
576 35,6 43 17 18
1112
DP.6088A 88
8,2 26
552 45,5 43 31 23
1127
Standard ISO R 868 ISO 37 ISO 37 ISO 37
ISO 34-1 ISO 4662 ISO 4649 ISO 815 ISO 1183
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